The dissolution enthalpy, ΔH_DS, and the formation enthalpy, ΔH_f,ox, of bulk lutetium‐doped cerium oxide (LuDC) were studied at 701°C in molten sodium molybdate. For the composition range of Ce_1−XLu_XO_2−X/2, studied 0 ≤ X ≤ 0.3, the ΔH_DS decreases linearly and smoothly with lutetium content according to ΔH_DS, kJ/mol = 73.5(1.0)−165.1(5.5)·x). The enthalpy of formation, ΔH_f,ox, becomes more exothermic linearly with lutetium content. No anomaly in ΔH_f,ox is observed at low Lu₂O₃ concentration as reported previously for several other rare‐earth‐doped ceria systems, suggesting possible differences in clustering and microstructure, which may also be related to difference in processing conditions.

中文翻译：

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bulk掺杂的Ce1-xLuxO2-x / 2化合物的能量学

溶解焓， Δ ħ _DS，并形成焓，Δ ħ_女，牛，本体掺杂镥氧化铈（LuDC）在701℃下熔融钼酸钠进行了研究。对于Ce的组成范围_{1- X}路_X ö _{2- X / 2}的研究，0≤  X  ≤  0.3，则Δ ħ _DS直线和平滑地镥内容根据Δ减小ħ _DS，千焦/摩尔= 73.5（1.0） -165.1（5.5）· x）。形成焓ΔH _f，ox随with含量的增加而线性增加。如先前针对其他几种稀土掺杂的二氧化铈系统所报告的，在低Lu ₂ O ₃浓度下未观察到ΔH _f，ox异常，这表明可能存在聚集和微观结构差异，这也可能与加工条件的差异有关。